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'The Thousands Game' printed from http://nrich.maths.org/
Why do this problem?
can be used when introducing or revising numbers in the thousands. Children's understanding of place value will be reinforced and discussion will give plenty of opportunities to emphasise appropriate vocabulary not only on place value but also on odd and even numbers. The game described can
transform what could be a tedious task into an engaging activity.
You could start by playing the game described in the problem with the whole group. You will need a set of digit cards. This sheet of digit cards can be printed out, preferably onto card. A bag is not necessary, but does add a little drama into the activity! The
important thing is that the cards should be picked unseen. This simple interactivity can be used for displaying the digit cards when they have been chosen. It should be noted that the cards (and bag) will still be required.
After this learners could work in pairs on the game. This sheet provides two "boards" for playing the game with the digit cards provided. Then they could go on to the actual problem from this sheet which gives the questions asked (but without the introduction).
At the end of the lesson the group can gather together to discuss, not only place value and comparing and ordering numbers, but also odd and even numbers. There should be plenty of opportunities to emphasise the appropriate vocabulary for the work they have been doing.
Which digit is most important if you are making the largest/smallest number possible?
To make the highest possible number, where would it be best to put the highest/lowest digit card?
If you want to make the lowest number, where would it be best to put the lowest/highest digit card?
What makes a number odd/even?
What kind of number will the units digit need to be to make an even number? What about an odd number?
Learners could play an alternative version of the game in which two players take turns in taking a digit card (unseen) and placing it on their board before taking the next card. This requires considerable thought and understanding. Children will enjoy playing Nice and Nasty
after having a go at this
Some children find place value difficult and even alarming. They could start with a similar activity using only three-digit numbers or even just two. Reading the numbers out loud may help turn what seems to them just a jumble of digits into something meaningful.